[ExI] Fermi question, possible answer

[Tomaz Kristan]

Faster rotation is a cause of warming. Please see why.

https://protokol2020.wordpress.com/2013/07/04/planet-rotation-extreme-case/

On Sat, Apr 4, 2015 at 6:09 PM, John Clark <johnkclark at gmail.com> wrote:

>
> On Sat, Apr 4, 2015 Tomaz Kristan <protokol2020 at gmail.com> wrote:
>
> > What is known as the faint sun paradox - why was so warm on Earth back
>> when our Sun was much fainter
>>
>
> Even more paradoxical is that 3 billion years ago on Mars, which is
> further from that fainter sun than the Earth, it was warm enough for liquid
> water to exist on it's surface. It's odd.
>
>
>> > has a strange answer. Be cause our planet rotated faster!
>>
>
> Earth once rotated in less than 6 hours but back then the moon was much
> closer and it's tidal forces slowed the rotation to 24 hours and is still
> slowing it down; but angular momentum must be conserved so as the Earth
> slows down the moon goes further away. Mars has no large moon to slow it
> down and yet strangely it has almost the same rotational period as the
> Earth. Coincidence I guess.
>
>
>> > Yes, that's right. A faster rotating planet is warmer!
>>
>
> I have heard that global warming could increase the rotation of the Earth
> because water expands when it gets warmer and water would tend to move from
> the equator to the poles, but it's a very small effect, less than a millisecond;
> and the faster rotation is a effect of warming not a cause.
>
>   John K Clark
>
>
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